[Ips-dsgr] ASWFC Daily Report - 30 May 26 issued 2330 UT on 30 May 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sun May 31 09:30:50 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/30 MAY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 30 MAY AND FORECAST FOR 31 MAY - 02 JUNE
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
-----------------------------------------------------------
1A. SOLAR SUMMARY
Activity 30 May: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 30 May: 142/96
1B. SOLAR FORECAST
31 May 01 Jun 02 Jun
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 142/96 140/94 136/90
COMMENT: Solar flare activity on UT day 30-May was at the R0
level, with no significant flare activity observed. There are
currently nine numbered sunspot regions visible on the solar
disk. Active regions (AR) 4449 (S10W14, beta) and 4446 (S13W20,
beta) were responsible for some low level C-class flares over
the UT day. AR 4451 (S16W00, beta) and 4455 (N14E32, beta) showed
spot development over the UT day and 4447 (S17W52, beta) show
division in its main spot. None of these regions appear magnetically
complex. AR 4452 (N09W57, beta-gamma) is the most magnetically
complex region, but appears to be in decay. All other sunspot
regions are either stable or in decay. Solar flare activity is
expected to be at R0-R1 levels over 31-May to 02-Jun. Solar radiation
storm conditions were at the S0 level on 30-May and are expected
to remain at the S0 level over 31-May to 02-Jun. No Earth-directed
coronal mass ejections (CMEs) have been observed. A fast, north
directed CME is visible in SOHO and STEREO-A imagery from 30/0848UT.
This CME is considered a far side event and not geoeffective.
The solar wind speed increased over the UT day 30-Mar, mostly
from 30/1700UT onwards. The wind speed mostly ranged between
370 and 570 km/s . The wind speed is currently at around 500
km/s. The peak total interplanetary magnetic field strength (IMF,
Bt) was 11 nT and the north-south IMF component (Bz) range was
-10 to +8 nT. The solar wind speed is expected to remain at current
levels over 31-May to 02-Jun, with a chance of an increase on
02-Jun due to a small equatorial coronal hole rotating towards
a geoeffective position.
-----------------------------------------------------------
2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 30 May: G0
Estimated Indices 30 May : A K
Australian Region 6 22111232
Cocos Island 5 22111222
Darwin 5 22111222
Townsville 6 22111232
Learmonth 8 22111333
Alice Springs 6 22111232
Gingin 8 22111333
Canberra 6 22101232
Kennaook Cape Grim 6 22102232
Hobart 6 22002232
Estimated Antarctic Regional K Indices 30 May :
Macquarie Island 7 22002233
Casey 11 33312323
Mawson 45 55312666
Observed Regional daily pc3 Indices 30 May :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 0 (Quiet)
Hobart 3 (Quiet)
Pc3 pulsations are high frequency (10-45 second period) variations
of the Earths magnetic field. Daily pc3-indices are the daily sum
of 20 minute pc3-indices for that station and have been shown to be
well correlated with rejection of high resolution aeromagnetic
survey flight-line data.
NOTE: Indices may have been generated from data obtained in
cooperation with the following organisations: Geoscience Australia,
University of Newcastle Space Physics Group, Australian Government
Antarctic Division and International Center for Space Weather
Science and Education, Japan.
Estimated AFr/Ap Indices 30 May : A
Fredericksburg 10
Planetary 12
Observed AFr/Ap Indices 29 May : A K
Fredericksburg 16
Planetary 15 3322 3343
2B. MAGNETIC FORECAST
Date Ap Conditions
31 May 10 G0, chance of G1
01 Jun 8 G0
02 Jun 10 G0, chance of G1
COMMENT: G0 geomagnetic conditions were observed in the Australian
and planetary regions on UT day 30-May. Mostly G0 geomagnetic
conditions were observed in the Antarctic region, with G2 conditions
observed at Mawson. G0 planetary geomagnetic conditions are expected
over 31-May to 02-Jun, with a chance of G1 on 31-May and 02-Jun
due to coronal hole high speed wind stream effects.
-----------------------------------------------------------
3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
30 May Normal Normal-fair Fair-normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
31 May Normal Normal Normal-fair
01 Jun Normal Normal Normal-fair
02 Jun Normal Normal Normal-fair
COMMENT: Global ionospheric conditions were mostly normal during
UT day 29-May, with some degradations at high and mid latitudes
in the northern hemisphere. Ionospheric conditions are expected
to be mostly normal over 31-May to 02-Jun, with some degradations
expected at high latitudes over the forecast period.
-----------------------------------------------------------
4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
30 May 95
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Near predicted monthly values during local day.
Depressed by 30% during local night.
Enhanced by 25% after local dawn.
Northern Australian Region:
Enhanced by 25% during local day.
Near predicted monthly values during local night.
Southern Australian Region:
Enhanced by 15% during local day.
Enhanced by 15% during local night.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values over the UT day.
Monthly T index:
Month T index
Apr 74
May 71
Jun 68
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
31 May 92 Near to 15% above predicted monthly values
01 Jun 88 Near to 15% above predicted monthly values
02 Jun 92 Near to 15% above predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) on 30-May were enhanced
by 25% in the northern Australian region during local day and
near predicted monthly values during local night. MUFs in the
southern Australian region were enhanced by 15% throughout the
day. Spread-F was observed at Hobart and Canberra during local
night hours. MUFs are expected to be near predicted monthly values
to 15% enhanced over 31-May to 02-Jun.
-----------------------------------------------------------
5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 29 May
Daily Proton Fluence >1 MeV: 8.1E+05
Daily Proton Fluence >10 MeV: 2.0E+04
Daily Electron Fluence >2 MeV: 1.80E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 3%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B7.3
DSCOVR Satellite Solar Wind Day Averaged Data for 29 May
Speed: 414 km/sec Density: 3.6 p/cc Temp: 78500 K Bz: -2 nT
(Courtesy Space Weather Prediction Center, Boulder USA)
-----------------------------------------------------------
Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au
More information about the ips-dsgr
mailing list